Earth-One? Earth-Two? Infinite Earths? Where did it all start? The path for the universe-altering Crisis began in the fondly remembered Silver Age tales contained within the CRISIS ON MULTIPLE EARTHS—a new 208-page trade paperback collecting the highly requested early JLA/JSA team-ups! This volume is a perfect companion piece to the CRISIS ON INFINITE EARTHS and HISTORY OF THE DC UNIVERSE trade paperbacks. Featuring the talents of writer Gardner Fox, penciller Mike Sekowsky, and inkers Bernard Sachs & Sid Greene—all guided by the vision of legendary editor Julius Schwartz—this volume also contains an all-new cover by award-winning painter Alex Ross! These incredible storytellers crossed over worlds to team up the Justice League of America (Earth-One) with their Golden Age predecessors, the Justice Society of America (Earth-Two)! Both teams combined forces to overcome world-shattering threats that would destroy their worlds! Now you can join DC’s greatest heroes in timeless adventures that changed the DC Universe for all time! This volume collects the first four 2-part “Crisis Crossover” adventures, reprinting JUSTICE LEAGUE OF AMERICA #21-22, 29-30, 37-38, and 46-47 (1963-1966). In their initial pairing, the JLA and JSA teamed up against such villains as Dr. Alchemy, Chronos, the Wizard, the Fiddler, Icicle, and Felix Faust. In the second story, we’re introduced to the Crime Syndicate of Earth Three (Johnny Quick, Super Woman, Ultraman, Power Ring, and Owlman) — evil counterparts to the JLA. Next up, Earth One’s evil Johnny Thunder takes control of the Earth-Two Thunderbolt and begins a chain reaction that could leave Earth-One without a Justice League! Finally, the last adventure introduces the Anti-Matter Man from the anti-matter universe, who sets Earths One and Two on a deadly collision course.